The new Mini Bicomp has exactly the same features as the pre-2003 BICOMP, just takes less real estate on your pedalboard. Same size as juicer or small comp (2.5" x 4.75" x 1.5" not including jacks, switch, etc). The only difference between the mini bi-comp and the new 4 knob bi-comp, is that the ATTACK control is on the inside. Works on battery or 9V DC adapter. Analog Man makes the cases in-house for a cost savings. They are not all perfectly machine-drilled and silk-screen labeled like the BICOMP, but have a hand-made appearance. The switches are a little closer together, making it easy to switch from one compressor to the other by pressing both switches at the same time. Use the side of your foot to easily switch just one side.